CN110099386A - The radio relay method of non-causal information is not depended in a kind of cognition network - Google Patents
The radio relay method of non-causal information is not depended in a kind of cognition network Download PDFInfo
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- CN110099386A CN110099386A CN201910304754.9A CN201910304754A CN110099386A CN 110099386 A CN110099386 A CN 110099386A CN 201910304754 A CN201910304754 A CN 201910304754A CN 110099386 A CN110099386 A CN 110099386A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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Abstract
The present invention provides the radio relay methods that non-causal information is not depended in a kind of cognition network, provide help to the communication of primary user using from user as relay node, reduce the outage probability of primary user；Using the method that interference alignment neutralizes using the interference signal come primary user received when being communicated from user, to achieve the purpose that relay primary user；By being neutralized from realizing to interfere by the way of the precoding that cooperates between user to the re-using from user's interference signal, so that relaying signal is glitch-free when reaching primary user receiving end.The beneficial effects of the present invention are: technical solution proposed by the invention can reduce the outage probability of primary user in the case where the information sent from user to main users is totally unknown, disobey resistance in non-causal primary user's information；It does not need that primary user is waited to transmit transmission signal to realize data sharing, to achieve the purpose that relay primary user from user.
Description
Technical field
The present invention relates to do not depended in relayed communications field more particularly to a kind of cognition network non-causal information it is wireless in
After method.
Background technique
Cognitive radio (CR) realizes intelligent frequency spectrum share based on dynamic frequency spectrum deployment, can greatly improve
The availability of frequency spectrum.One Secondary Users should be able to reliably perceive the spectrum environment of surrounding, accurately detect legal main use
The side information at family, to be adaptively adjusted emission parameter to be communicated, and guaranteeing will not in entire communication process
Main users are caused with the decline of communication performance.However, due to Secondary Users to the perception of main users be built upon feedback and
On the basis of Radio Link symmetry, the uncertainty of Radio Link is difficult Secondary Users to the perception of main users
Accomplish perfection, so, the communication of Secondary Users is inevasible to main users communication performance shadow in actual application
It rings.How this hot spot one of that influences become cognitive radio research is eliminated.
The cognition network of Overlay assumes Secondary Users before main users send information with regard to non-causal perception master
The transmission information of user is wanted, so many researchs in overlay CR are all in the way of cooperative coding come for main
User gives certain compensation, so that the communication performance of main users is unaffected there are Secondary Users.But
These methods are built upon under the precondition that Secondary Users successfully perceive main users information, and such precondition is to main
The information security of user brings very big problem, and the process of the information of acquisition main users is also for Secondary Users
Non-causal, therefore be difficult to be applied in actual system.In the case where main users information can not be perceived, such as:
In the cognition network of underlay, how to realize Secondary Users to the compensation of the communication performance of main users or a needs
The problem of research.
Summary of the invention
To solve the above-mentioned problems, the present invention provides the wireless relay that non-causal information is not depended in a kind of cognition network
Method.
The radio relay method of non-causal information is not depended in a kind of cognition network, is applied in cognitive radio system,
The cognitive radio system includes: primary user's transmitting terminal PT, primary user receiving end PR, first from user transmitting terminal ST1, first
From user receiving end SR1, second from user transmitting terminal ST2 and second from user receiving end SR2；It is characterized in that, described one kind
The radio relay method that non-causal information is not depended in cognition network, specifically comprises the following steps:
S101: primary user's transmitting terminal PT in a broadcast manner transmission packet to primary user receiving end PR, while first from
User transmitting terminal ST1 and second is from user transmitting terminal ST2 respectively to first from user receiving end SR1 and second from user receiving end
SR2 sends first message packet and second message packet；
Does S102:PR receive the message package of PT transmission? if so, arriving step S103；Otherwise, step is arrived
S104；
S103:PR sends confirmation in a broadcast manner and receives signal ACK to PT, SR1 and SR2；SR1 and SR2 receives institute
After stating confirmation reception signal ACK, that is, desired signal is decoded, abandon the remainder data packet received, PT receives the confirmation and connects
Collection of letters ACK prepares the message package communicated next time；And return step S101；
S104:PR transmits and receives failure signal NAK to PT, SR1 and SR2 in a broadcast manner；
After S105:SR1 receives the reception failure signal NAK, the first message packet that decoding ST1 is sent retains
The second message packet that the message package and ST2 that PT is sent are sent, and by the second message packet and the message package one
It rises as the first relaying signal；After SR2 receives the reception failure signal NAK, the second message of decoding ST2 transmission
Packet, and the message package that the ST1 first message packet sent and PT are sent is together as the second relaying signal；And SR1
Relaying preparatory signal CTR will be sent to ST1 and ST2 respectively with SR2, to inform ST1 and ST2 respectively, pause sends data；
S106:PT sends the message package to PR in a broadcast manner again；Meanwhile SR1 and SR2 are respectively by described first
Relaying signal and the second relaying signal are sent to main PR；
S107:PR removes the first message packet and described in the second relaying signal using the method that interference alignment neutralizes
Second message packet in first relaying signal, and the first relaying signal, the second relaying signal and the institute that will be received
The message package decoding stated in message package retains, to achieve the purpose that signal relaying enhancing；
Does S108:PR receive the message package of PT transmission? if so, returning to step S103；Otherwise, PR is with wide
The mode broadcast transmits and receives failure signal NAK to PT, SR1 and SR2；And return step S106.
Further, in step S102, the message package of PT transmission is successfully decoded in PR, that is, is represented PR and had received PT hair
The message package sent.
Further, in step S103, SR1 and SR2 are received after the confirmation receives signal ACK, i.e. letter needed for decoding
Number, the remainder data packet received is abandoned, specifically: SR1 decodes the first message packet that ST1 is sent, and abandons what PT was sent
The second message packet that the message package and ST2 are sent, SR2 decode the second message packet that ST2 is sent, and abandon PT and send
The message package and ST1 send the first message packet.
Further, in step S108, after PR transmits and receives failure signal NAK to SR1 and SR2 in a broadcast manner, ST1
It is the transmission for suspending the message package of next round communication with ST2.
Technical solution provided by the invention have the benefit that technical solution proposed by the invention can from
In the case that the information that family sends primary user is totally unknown, the outage probability of primary user is reduced, is disobeyed resistance in non-causal master
User information；Repetition policy different from the past does not need that primary user is waited to transmit transmission signal to realize data from user
It is shared, to achieve the purpose that relay primary user；It is not only able to effectively reduce the outage probability of primary user, it can also be
Guarantee primary user's communicativeness not by from user when being not higher than 10dB from the communication signal emitting power of user itself well
Influence.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the process for not depending on the radio relay method of non-causal information in the embodiment of the present invention in a kind of cognition network
Figure；
Fig. 2 is the model schematic of cognitive radio system in the embodiment of the present invention；
Fig. 3 is the communication for not depending on the radio relay method of non-causal information in the embodiment of the present invention in a kind of cognition network
State transition graph.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
The embodiment provides the radio relay methods that non-causal information is not depended in a kind of cognition network.
Referring to FIG. 1, Fig. 1 is the wireless relay for not depending on non-causal information in the embodiment of the present invention in a kind of cognition network
The flow chart of method is applied in cognitive radio system shown in Fig. 2, and the cognitive radio system includes: primary user's hair
End PT, primary user receiving end PR, first are penetrated from user transmitting terminal ST1 (from 1 transmitting terminal of user), first from user receiving end SR1
(from 1 receiving end of user), second from user transmitting terminal ST2 (from 2 transmitting terminal of user) and second from user receiving end SR2 (from
2 receiving end of family)；It is characterized in that, the radio relay method of non-causal information is not depended in a kind of cognition network, it is specific to wrap
Include following steps:
S101: primary user's transmitting terminal PT in a broadcast manner transmission packet to primary user receiving end PR, while first from
User transmitting terminal ST1 and second is from user transmitting terminal ST2 respectively to first from user receiving end SR1 and second from user receiving end
SR2 sends first message packet and second message packet；
Does S102:PR receive the message package of PT transmission? if so, arriving step S103；Otherwise, step is arrived
S104；
S103:PR sends confirmation in a broadcast manner and receives signal ACK to PT, SR1 and SR2；SR1 and SR2 receives institute
After stating confirmation reception signal ACK, that is, desired signal is decoded, abandon the remainder data packet received, PT receives the confirmation and connects
Collection of letters ACK prepares the message package communicated next time；And return step S101；
S104:PR transmits and receives failure signal NAK to PT, SR1 and SR2 in a broadcast manner；
After S105:SR1 receives the reception failure signal NAK, the first message packet that decoding ST1 is sent retains
The second message packet that the message package and ST2 that PT is sent are sent, and by the second message packet and the message package one
It rises as the first relaying signal；After SR2 receives the reception failure signal NAK, the second message of decoding ST2 transmission
Packet, and the message package that the ST1 first message packet sent and PT are sent is together as the second relaying signal；And SR1
Relaying preparatory signal CTR will be sent to ST1 and ST2 respectively with SR2, to inform ST1 and ST2 respectively, pause sends data；
S106:PT sends the message package to PR in a broadcast manner again；Meanwhile SR1 and SR2 are respectively by described first
Relaying signal and the second relaying signal are sent to main PR；
S107:PR removes the first message packet and described in the second relaying signal using the method that interference alignment neutralizes
Second message packet in first relaying signal, and the first relaying signal, the second relaying signal and the institute that will be received
The message package decoding stated in message package retains, to achieve the purpose that signal relaying enhancing；
Does S108:PR receive the message package of PT transmission? if so, returning to step S103；Otherwise, PR is with wide
The mode broadcast transmits and receives failure signal NAK to PT, SR1 and SR2；And return step S106.
In step S102, the message package of PT transmission is successfully decoded in PR, that is, is represented PR and had received the described of PT transmission
Message package.
In step S103, SR1 and SR2 are received after the confirmation receives signal ACK, i.e. decoding desired signal, discarding connects
The remainder data packet received, specifically: SR1 decodes the first message packet that ST1 is sent, and abandons the message package that PT is sent
The second message packet sent with ST2, SR2 decode the second message packet that ST2 is sent, and abandon the message that PT is sent
The first message packet that packet and ST1 are sent.
In step S108, after PR transmits and receives failure signal NAK to SR1 and SR2 in a broadcast manner, ST1 and ST2, that is, temporary
Stop the transmission of the message package of next round communication.
In step S107, PR removes the first message packet in the second relaying signal using the method that interference alignment neutralizes
With it is described first relaying signal in second message packet, and will receive it is described first relaying signal, it is described second relaying letter
Number and the message package in the message package decoding retain method are as follows:
In order to realize relaying and maximize the received signal-to-noise ratio of primary user, when SR1 and SR2 is as relay node
Using precoding vectors v1And v2；
When the first relaying signal, the second relaying signal and the message package reach PR, what PR was received
SignalAre as follows:
In above formula, the first item of right side of the equal sign is useful signal, second and third is interference signal, and Section 4 is noise；Its
In, PpAnd PrIt is the transmission power of primary user's transmitting terminal PT and the repeat transmitted power from user transmitting terminal (ST1 and ST2) respectively；WithIt respectively indicates between the channel and SR2 and PR between channel, SR1 and the PR in t time slot between PT and PR
Channel；xp、xr1And xr2It is the transmitting signal of PT, the relaying signal of SR1 and SR2 relaying signal respectively；n0It is white Gaussian noise；
Enable precoding vectors v1And v2Value respectively shown in following formula, to maximize useful signal signal-to-noise ratio and neutralize
Distracter:
In above formula, dp1、d12And dp2Be respectively primary user and first from user, first from user and second from user, primary
Family and second is from the distance between user；α is parameter of the channel with range attenuation (value in embodiments of the present invention is 2)；
PsFor first and second from user t-1 time slot transmission power；β is the normalization coefficient (preset value) of precoding vectors；No
Channel representative with subscript r is the channel of t-1 time slot: h1pFor the channel between the SR1 and PT of t-1 time slot.h12For t-1 time slot
SR1 and ST2 between channel.
Referring to Fig. 3, Fig. 3 is the wireless relay for not depending on non-causal information in the embodiment of the present invention in a kind of cognition network
The communications status transition diagram of method；As shown in figure 3, in t-1 time slot, primary user to and Secondary Users to communicating simultaneously.If PR
It is successfully decoded, then it issues ACK.After receiving ACK, Secondary Users' receiver SR will decode desired signal and abandon and receives
Remainder data packet is at this time normal communication state S0.Then, all PT, ST1 and ST2 are ready for sending new message package；Its
In, PT and PR form primary user couple；ST1 and SR1, ST2 and SR2 separately constitute two Secondary Users couple；
If PR can not be decoded, PR issues NAK, is received simultaneously by PT, SR1 and SR2, Secondary Users' receiver SR solution
Signal needed for code oneself, and remaining signal (" interference ") received is stored in its buffer, and SR1 and SR2 will
" relaying preparation " (CTR) signal is sent to ST1 and ST2 respectively；It is at this time relayed communications state S1；
Message package is retransmitted to PR in time slot t, PT.CTR is had sent if there is Secondary Users' receiver, then is had sent
Secondary Users' receiver SR of CTR will send in this time slot and be stored in its buffer " interference " as its relaying signal.It is main
User's receiver PR is wanted to receive the signal from SR and PT by combining received mode.
The performance of A method proposed by the invention in Rayleigh channel and UWB channel is imitated by monte carlo method
Very, effect can be verified.
The beneficial effects of the present invention are: technical solution proposed by the invention can be in the letter sent from user to primary user
Cease it is totally unknown in the case where, reduce the outage probability of primary user, disobey resistance in non-causal primary user's information；It is different from the past
Repetition policy, do not need to wait primary user to transmit from user and send signal to realize data sharing, to reach to primary user
The purpose relayed；It is not only able to effectively reduce the outage probability of primary user, can also believe from the communication of user itself
Number transmission power guarantees that primary user's communicativeness is not influenced by from user when being not higher than 10dB well.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. not depending on the radio relay method of non-causal information in a kind of cognition network, it is applied in cognitive radio system, institute
State cognitive radio system include: primary user's transmitting terminal PT, primary user receiving end PR, first from user transmitting terminal ST1, first from
User receiving end SR1, second are from user transmitting terminal ST2 and second from user receiving end SR2；It is characterized in that, described one kind is recognized
The radio relay method that non-causal information is not depended in Hownet network, specifically comprises the following steps:
S101: primary user's transmitting terminal PT transmission packet is to primary user receiving end PR in a broadcast manner, while first from user
Transmitting terminal ST1 and second is from user transmitting terminal ST2 respectively to first from user receiving end SR1 and second from user receiving end SR2
Send first message packet and second message packet；
Does S102:PR receive the message package of PT transmission? if so, arriving step S103；Otherwise, step S104 is arrived；
S103:PR sends confirmation in a broadcast manner and receives signal ACK to PT, SR1 and SR2；SR1 and SR2 receives described true
Recognize after receiving signal ACK, i.e. decoding desired signal, abandon the remainder data packet received, PT receives the confirmation and receives letter
Number ACK prepares the message package communicated next time；And return step S101；
S104:PR transmits and receives failure signal NAK to PT, SR1 and SR2 in a broadcast manner；
After S105:SR1 receives the reception failure signal NAK, the first message packet that decoding ST1 is sent retains PT hair
The second message packet that the message package and ST2 sent are sent, and the second message packet and the message package one are acted as
For the first relaying signal；After SR2 receives the reception failure signal NAK, the second message packet that decoding ST2 is sent, and
The message package that the ST1 first message packet sent and PT are sent is together as the second relaying signal；And SR1 and SR2
Relaying preparatory signal CTR will be sent to ST1 and ST2 respectively, to inform that ST1 and ST2 pause sends data respectively；
S106:PT sends the message package to PR in a broadcast manner again；Meanwhile SR1 and SR2 are relayed described first respectively
Signal and the second relaying signal are sent to main PR；
S107:PR removes the first message packet and described first in the second relaying signal using the method that interference alignment neutralizes
The second message packet in signal is relayed, and by the first relaying signal received, the second relaying signal and described is disappeared
The message package in breath packet, which decodes, to be retained, to achieve the purpose that signal relaying enhancing；
Does S108:PR receive the message package of PT transmission? if so, returning to step S103；Otherwise, PR is to broadcast
Mode transmits and receives failure signal NAK to PT, SR1 and SR2；And return step S106.
2. not depending on the radio relay method of non-causal information in a kind of cognition network as described in claim 1, feature exists
In: in step S102, the message package of PT transmission is successfully decoded in PR, that is, represents the message that PR has received PT transmission
Packet.
3. not depending on the radio relay method of non-causal information in a kind of cognition network as described in claim 1, feature exists
In: in step S103, SR1 and SR2 are received after the confirmation receives signal ACK, i.e. decoding desired signal, are abandoned and are received
Remainder data packet, specifically: SR1 decodes the first message packet that ST1 is sent, and abandons the message package and ST2 that PT is sent
Send the second message packet, SR2 decode ST2 send the second message packet, abandon PT send the message package and
The first message packet that ST1 is sent.
4. not depending on the radio relay method of non-causal information in a kind of cognition network as described in claim 1, feature exists
In: in step S108, after PR transmits and receives failure signal NAK to SR1 and SR2 in a broadcast manner, under ST1 and ST2 i.e. pause
The transmission of the message package of one wheel communication.
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